Calendar获取第二天时间

Calendar calendar = Calendar. getInstance();
calendar.setTime( new Date());
calendar.set(Calendar. HOUR_OF_DAY, 2);//获取之间为第二天凌晨2点
calendar.set(Calendar. MINUTE, 0);
calendar.set(Calendar. SECOND, 0);
calendar.set(Calendar. MILLISECOND, 0);
calendar.add(Calendar. DAY_OF_MONTH, 1);
Date date = new Date();
date = calendar.getTime();
System. out.println(date);
/**
 * 将date类型的时间转换成String类型
 */
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss" );
String str = sdf.format(date);
System. out.println(str);
Long temp = date.getTime()-System.currentTimeMillis();
System.out.println(temp);//获取与当前时间差值